From a Towel March against the Vogon violence in Sao Paolo to a combat de serviette in Paris, Douglas Adams fans around the world are grabbing their towels and hitting the streets. For yes, it is Towel Day again, and time to honour the hoopy frood who died – I can't quite believe it's been this long – 10 years ago.

The science fiction author actually died on 11 May but fans gathered for a wake on the 25th, a date which has been marked ever since by legions of Hitchhiker aficionados bearing towels, taking seriously Adams's advice that the item is "about the most massively useful thing an interstellar hitchhiker can have". The anniversary has since snowballed into a worldwide phenomenon: this morning #towelday is top of Twitter's trending topics, as readers reveal their own towel-bearing antics.

Fancy a Vogon Poetry Slam and a round of Pan-galactic gargle blasters? Head to London. There's towel-wearing flash mobs in Krakow and Bregenz, Austria, a meeting at the Restaurant at the End of the Universe in Bali, concerts and get-togethers and readings around the world (see www.towelday.org for a full list).

Douglas Adams fans are the best. Now excuse me while I go and find a towel to drape around my shoulders while I work. And please: don't forgot to share your own towel-wearing exploits with us – if you don't, as yet, have any planned, then let Adams himself remind you just why it's worth knowing where your towel is.

"Partly it has great practical value - you can wrap it around you for warmth as you bound across the cold moons of Jaglan Beta; you can lie on it on the brilliant marble-sanded beaches of Santraginus V, inhaling the heady sea vapours; you can sleep under it beneath the stars which shine so redly on the desert world of Kakrafoon; use it to sail a mini raft down the slow heavy river Moth; wet it for use in hand-to- hand-combat; wrap it round your head to ward off noxious fumes or to avoid the gaze of the Ravenous Bugblatter Beast of Traal..." And so on.

As Adam sagely concludes: "Any man who can hitch the length and breadth of the galaxy, rough it, slum it, struggle against terrible odds, win through, and still knows where his towel is is clearly a man to be reckoned with."